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A Hydrochemical Method for Identifying Orbital Imprints of Dust in Paleofluvial Sequences

التفاصيل البيبلوغرافية
العنوان: A Hydrochemical Method for Identifying Orbital Imprints of Dust in Paleofluvial Sequences
المؤلفون: Zhongyi Yan, Yibo Yang, Wenxia Han, Yudong Liu, Xiaoming Liu, Xiaomin Fang
المصدر: Geophysical Research Letters, Vol 51, Iss 14, Pp n/a-n/a (2024)
بيانات النشر: Wiley, 2024.
سنة النشر: 2024
المجموعة: LCC:Geophysics. Cosmic physics
مصطلحات موضوعية: Geophysics. Cosmic physics, QC801-809
الوصف: Abstract Mineral dust plays an important role in Earth's climate system, yet it is difficult to identify dust imprints in paleofluvial sediments, especially on orbital timescales. Here, we present high‐resolution authigenic carbonate Ca–Mg–Sr compositions in a fluvial sequence under the transport pathway of Asian dust. The Mg/Ca, Sr/Ca, and Mg/Sr ratios exhibit distinct transitions in both secular trends and orbital cycles at ∼8 Ma. Before ∼8 Ma, given similar Mg and Sr partitioning behaviors during carbonate formation, hydroclimate changes yielded strong orbital signals in the Sr/Ca and Mg/Ca ratios but no detectable signals in the Mg/Sr ratios. After ∼8 Ma, given the strengthened input of Mg‐rich dust during cold‒dry periods, the Mg/Sr and Mg/Ca ratios clearly exhibited orbital signals, but the Sr/Ca ratio did not. Such transitions in carbonate composition corroborate the dust‐induced changes in fluvial hydrochemistry, offering an innovative methodology for detecting orbital dust cycles in paleofluvial systems.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 1944-8007
0094-8276
Relation: https://doaj.org/toc/0094-8276; https://doaj.org/toc/1944-8007
DOI: 10.1029/2024GL109988
URL الوصول: https://doaj.org/article/37852ce9a979454da723246a64f8f23e
رقم الأكسشن: edsdoj.37852ce9a979454da723246a64f8f23e
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:19448007
00948276
DOI:10.1029/2024GL109988